The threat is less from Iran directly than from a weapon given to a surrogate, like Hezbollah. If Israel is attacked by a stateless terror organization with Iranian weapons, what exactly is the return address at which Israel's retaliation is directed? And, without a credible threat of retaliation on the attacker, how is such an attack deterred?
Clashes between IDF and protesters in Bethlehem and East Jerusalem (Reuters)
from the article: Iranian threat to destroy Israel doesn't hold up